Learning projectdoc is best done by using it. To do so the projectdoc Toolbox provides a demo space to be created on your Confluence server.

This space explains a couple of projectdoc's concepts and - since the pages are editable in your space, makes it easy to see how it works and maybe play with its macros and pages. The space is also available online at projectdoc Demonstration Space.

There is also a Hands-on Tutorial to guide you through the process of creating some spaces and using tools from the toolbox by a step-by-step tutorial.